If she is in school right now, might she have gone through fire safety or a tornado drill at school? When I was a young child, the fear of death tended to resurface whenever we had school safety presentations about disaster scenarios (or car accidents as an older child) or when a friend of mine had lost a grandparent or sibling. DC15 was also quite scared about death after watching a movie in which a pet died. Reading books about it and creating plans for disasters (like a house fire) really helped both of us understand and allayed our fears.
